<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      async function add(a, b) {
        return a + b;
      }
      // function add(a, b) {
      //   return new Promise((reslove, reject) => {
      //     reslove(a + b);
      //   });
      // }
      add(1, 2).then((data) => {
        console.log(data);
      });

      // console.log(add(1, 2)); //3
    </script>
  </body>
</html>
